Fuel-saving attachment for furnaces.



N. J. RUSSELL.

FUEL SAVING ATTACHMENT FOR FURNACES.

APPLICATION FILED MAY 1, T916.

Patented Nov. 21, 1916.

Uld gf ridf ljfd NELSON J. RUSSELL, 03? CHECAGQ,

FUEL-SAVING ATTACHMENT FOB FURNAGES.

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incense.

Specification of Letters Patent,

Application filed may 1, 1918. Serial No. 94,611.

of Illinois, have invented certain new and useful Improvements in Fuel-Saving Attachments for Furnaces, of which the following is a specification.

This invention relates to improvements in a device adapted for use in connection With furnaces, stoves or ranges, for pro-heating air and discharging or distributing said heated air into the fire-pot or fire-space, to the end, that more perfect combustion may be attained, and it consists in certain peculiarities of ti a construction, novel arrangement and operation of the various parts thereof as will be hereinafter more fully set forth and specifically claimed.

The main object of the invention is to provide an extremely simple and inexpensive device for automatically admitting,

heating and discharging or distributing at n ospheric air into furnaces, such as stoves, ranges, bake-ovens, l)OllI*flllI121C6S, and the like, in such a manner that the supply'of air to the furnace, Will, through the medium of the device, be heated to a high degree of temperature, and in such condition discharged or distributed in the furnace, and by preference, in the firebox or pot thereof, to commingle with the combustible and volatile gases emanating from the burning fuel,

Where said heated air and oxygenvvill be utilized to increase from a given amount of fuel, the combustion of the combustible trully With an opening 11, around which gases, or of the free carbon released during the burning of such fuel, thereby avoiding,

to a marked degree, the formation of smoke,

yet attaining the maximum amount of heat units from the fuel, for it is a Well known fact that smoke is due to a lack of air at the proper temperature at the point Where the volatile gases should be consumed;

Another object of the invention is to provide an attachment of the above describedgeneral character, Which, if desired, can be readily attached to the door of'the stove,- v furnace, or range, leading to thefirebox' thereof, and user in connection With said door, in such a manner that it will not interfere with the opening or closing of the door, or With feeding fuel to the grate of the fire-box, or if desired, said attachmentmay' be mounted Within the furnace in a station-. ary or immovable manner. I

. which is, by preference, substantially spher.

Fatented Nov, this,

and partly in elevation of a fragment of the fire-box or fire-space of a furnace, stove or range, showing a fuel saving attachment embodying my invention mounted noon the door thereof and located in position for use. Fig. 2 is an enlarged plan sectional view taken on line *22 of Fig. 1 looking in the direction indicated by the arrows. l 3 is a vertical sectional view taken on line 33 of Fig. 2 looking in the direction in dicated by the arrows, and Fig. iisa re duced fragmental sectional vies taken on line 3 3 of Fig. 2, showing a modification in the construction of the expansion chamber of the device.

Like numerals of reference refer to corresponding parts throughout the different views of the drawing.

Thenumeral 5 designates a portion of the front Wall of a stove, range or furnace, which may be of the ordinary or any preferred construction, but as usual, is provided with a lire-box din the loiver portion ofwhich is located a grate 7 on which the coal or other fuel 8 is placed for consumption through a doorway 9 formed in the front Wall or portion of the furnace, oven or range. Mounted on the outer surface of the front Wall of the fire-b051, in the usual manner, is a door 10 which is provided cen-.

opening is located and secured by means of bolts12, a flange 13 on the front part of the receiving chamber or box 1% of the attachment or device, Which consists of a. horizontally disposed member or plate, which is designated as a Whole by the reference nit-- As is clearly shown in Figs. 2, 3 and it of the drawing, the horizontally disposed plate or memberl5 1s provided With a convolute conduit or passageway 16 which comniunicates at one of its ends with the bO-X or re .ceiving chamber 1% and at its other end vvr" an expansion and discharging chamber f 2 pin or her, w thcr poi tion will ll(i below the y reference to t will be seen that the end i6, which communicates with the discharging chamber 17' contracted as at 18, thus forming a threat the purpi to be presently 6X- piained. 'ihe upper portion of the chamber is provided with a vertical slot 19 of i atcd air, and the casing i is provided in lower portion with a downwardly enlarged openu 20, which, under certain conditions, or sun-es, is also employed for the heated air from the attachment. in big. is illustrated a modification in the construction of he casing of the expani dischaz n chamber, which consists in providing the casing or chamber 17 in its upper and lower portions with slots 19 of about equal size, instead. of forming the lower slot than the upper one, as is chown in the other views of the drawing and above described. @therwise, the modified coi'istruction shown in 4: is identically the same that above shown and described. The operation of the device is simple,and as follows: The receiving box or chamber is: of the horizontally disposed plate or member is secured to the inner surface door of furnace, stove for and around an opening ll, therein atmospheric air can pass through in me door and into the box from whence it will pass ough the co volute conduit 16 in the dited by the in Fig. 2 the drawing. t will he understood that the device is located horizontally within the fire-box of the :irnace and above thefuel on. the grate thereof, in about the position shown in 1 of the drawings, and it is obvious that when the fire is started, and the fuel begins burn on the grate, some of the heat will pass into the enlarged opening of v, the expansion chamber 17 and out irough the slot 19 in the upper portion of air within the conduit 16 of the attachment ll be discharged from the expansion chain 1 .E-L d chamber, tens creating a drain thereber 17 through the opening 19, as well as l the open 20 thereof and will be red rearwariily to =irommingle with the volatile and combustible gases in the firebox, and especially at the rear portion of attachment. ll hen modified construction shown in i ig. l is employed, practically the same operation and result is attained except that the slot 19 in the lower po tion of the expansionchamber 1? will not act so much as an upwardly extended flue for the heat from the fuel when the fire is first started, as will the enlarged opening 20 shown in the other construction.

it will be observed by reference to Fig. 3 that the convolutions of the conduit 16 are cones-ail by comparatively thin webs 21 which will permit said convolutions to be rost entirely exposed to the heat of the furnace, to,the end, that the air passing through the conduit will be quickly heated.

In order to strengthen the device at its front portion, the receiving box or chamber 14 may be connected to the front part of the member 15 on each side thereof by means of a rib or web 22 which will also serve in connection with the member 15 as a baffle plate in the upward progress of the heat from the flue.

Having thus fully described my invention what ll claim as new and desire to secure by Letters Patent is- .L. lin a fuel saving attachment for furnaces, the combination with a furnace having a combustion chamber and an opening leading thereto, of a plate or member having a receiving chamber-casing mounted in.

communication with said opening and withopening, the said plate or member also having a convolute conduit communicating at one of its ends with said receiving chamber and at its other end with said hollow enlargement.

2. In a fuel saving attachment for furnaces, the combination with a furnace having combustion chamber and an opening leading thereto, of a plate or member having a receiving chamber-casing mounted in communication with said opening and within the combustion chamber, said plate or member being horizontally disposed and provided about centrally thereof with a hollow enlargement having in its upper and lower portions each a transversely extended opening, the opening in the lower portion I of said enlargement being outwardly flared, the said plate or member also havinga convolute conduit communicating at one of its ends with said receiving chamber and at-its other end with said hollow enlargement. 13o

3. In a fuel saving attachment for furnaces, the combination with a furnace wall having a doorway, of a hinged door there for. said door having an opening therein leading to the combustion chamber of the 'lurnace, a plate or member having a receiving chamber-casing mounted on the inner surface of the door in communication with the opening therein said plate or member being horizontally disposed and provided about centrally thereof with a hollow enlargement having in its upper and lower portions each, a transversely extended opening, the saidplate or member also having a convolute conduit communicating at one of its ends with said receiving chamber and at its other end with said hollow enlargement.

4. As a new article of manufacture, a plate or member having at its edge a receiving chamber-casing and provided with a convolute conduit leading from said chamber-casing to the central portion of said plate or member and having its inner end contracted, a hollow enlargement on the cen" tral-portion of the said member in communication with said conduit and having in its upper portion a slot extended in parallelism with said chamber casing and in its lower portion a downwardly enla ged openmg.

NELSUN J. RUSSELL.

Witnesses CHAS. C. TILLMAN, A. E. OLSON. 

